Diamondbacks place rookie outfielder Tommy Troy on injured list with sprained right AC joint

The Arizona Diamondbacks will begin the second half without rookie outfielder Tommy Troy after the first-round pick in the 2023 Draft was placed on the 10-day injured list with a sprained right AC joint. The injured list designation is retroactive to Sunday, per the team’s official transaction update, meaning Troy’s availability is already pushed back even as Arizona adjusts its plans for the opening days of the stretch.

This is the first time Troy has been placed on the IL in his professional career, which makes the timing more notable. The sprain is specifically to his right AC joint, an injury to the connection between the collarbone and shoulder that can affect range of motion and how a player performs movements involved in catching, throwing, and accelerating through the outfield.

Arizona’s release also indicates the team had not yet replaced Troy on its active roster at the time of publication. That detail matters because the Diamondbacks have to decide quickly how to cover outfield innings, absorb any defensive shuffling that might come with losing a rookie bat and/or glove, and keep their everyday core from wearing down as the schedule turns toward the final two months.

For a young player, the purpose of the 10-day window is to create space for recovery without dragging the team into an extended roster uncertainty. Still, an AC joint sprain can vary widely in timeline from player to player and can influence how soon a player is comfortable in full baseball actions, particularly those that require shoulder strength and stability.

The Diamondbacks, meanwhile, will treat this as a lineup and depth-management issue as much as a medical one. Losing a first-round talent changes not only the immediate outfield picture, but also the developmental arc around him. Troy’s role as a rookie contributor carries weight for Arizona’s longer-term roster planning, making it important for the organization to limit disruptions to his return plan and to ensure he regains full functional capacity before being asked to play heavy innings.

Arizona’s immediate challenge will be to map out game-by-game alternatives while the injured list ruling runs its course. With roster moves pending at the time of the update, the early second-half weeks will reveal how the Diamondbacks prefer to distribute playing time, whether through internal outfield options, increased reps for other perimeter players, or a short-term shakeup to protect regulars.

Beyond the next 10 days, the larger question is what Troy’s availability means for the outfield composition when the games intensify. For now, the team’s official update places the focus on recovery and roster timing, with the next checkpoint arriving when he is eligible to return and Arizona can confirm whether the sprained right AC joint has fully settled. That is the moment the story shifts from absence to reintegration, and it will likely shape how the Diamondbacks stabilize their run toward the postseason push.